Well apparently not but instead it looks like there is a DLC contract issue between Crytek and Valve: http://exophase.com/23486/ea-pulls-crysis-2-from-steam-store-now-only-on-origin/

It’s unfortunate that Steam has removed Crysis 2 from their service. This was not an EA decision or the result of any action by EA.

Steam has imposed a set of business terms for developers hoping to sell content on that service – many of which are not imposed by other online game services. Unfortunately, Crytek has an agreement with another download service which violates the new rules from Steam and resulted in its expulsion of Crysis 2 from Steam.

Crysis 2 continues to be available on several other download services including Origin.com.

Although there are some reports that EA is behind this and is starting to release games on Origin as exclusive, like the latest Crysis 2 Download content.

Obviously this might impact how people purchase Battlefield 3.

There's a lot of talk about people just pirating the games they want because of this. Please do not pirate games as that will result in even more strict avenues to purchasing games, and besides that IS stealing and unless you look at yourself as a criminal the answer is simple, don't buy if you don't like the terms. That's the message you want to send EA and for that matter Crytek or any other game developer, that you will not pirate it, nor will you buy under the current conditions. The result is that they will change the conditions.

Origin of War
EA rattles its sabres at Steam – but Origin’s strategy is a throwback to the bad old days
When it first became clear that digital distribution was going to be a big part of the future for game software, one often-stated fear was that the industry’s big publishers would never be able to co-exist on a single digital distribution platform. After years of duking it out for prominent positioning in bricks and mortar retailers, with little other than mounting POS marketing budgets to show for it, the temptation to do in the digital world what had been impossible in the physical world would be too great. Every publisher would build their own store, with their own products displayed in the shop window and their own direct relationship to the customer. Problem solved.
Problem solved, that is, for everyone except the consumer. The put-upon PC gamer would end up having to install a digital distribution client for every single publisher whose games he wanted to play. He’d need a unique login for each of those stores, he’d need to trust each of them with his personal and financial details, and to make matters worse, he’d probably end up having to maintain separate friends lists on each service, since the chances of inoperability didn’t look high.
Oddly, one of the worst culprits of this kind of anti-consumer thinking seemed to be Valve, whose announcement of Steam seemed to bring a whole new level of ridiculous to the scenario. Steam wasn’t a digital distribution system for a publisher – it was a system entirely focused on one developer, and a developer whose track record for regular software releases wasn’t exactly brilliant, either. In effect, it was an entire digital distribution system demanding installation on your PC for one game only – Half-Life 2.

This is an excerpt, read the full piece here. (http://www.gamesindustry.biz/articles/2011-06-17-origin-of-war-editorial)